HelixToolkit.SharpDX - Transparent billboard

Hi

Great work on the new version of HelixToolkit! Really impressed by the work done!

A small question: When I set the transparency of a billboard to Color.Transparent the billboard gets transparent (great). One small problem I have right now: other billboards that are behind this billboard gets cut. Is there any way of solving this problem?

Picture:

Best regards

Isdas